The camera-fitted contact lenses could detect light, color, movement or faces. The camera lens would be positioned on the eyeball below the pupil so that it would not impair vision.

One of the objections to Google Glass spectacles is that you don’t know when someone might be taking your picture, assuming you don’t notice the light on the side of the glasses or hear the person issue the “OK Google Glass” command.

That problem is potentially overcome by moving the smarts into a contact lens.

Sure, you may not know if someone wearing a future version of Google contact lenses is taking your picture. But they also don’t know that you potentially could be taking their picture.